Mix sexy and serene and you’ve got 156-room W Retreat & Spa, Vieques Island, an oasis within an oasis (since Vieques, just a 20-minute flight from San Juan, is a little slice of island heaven all on its own). Divide your time between two nearly deserted beaches (Whisper Beach is, ahem, clothing optional), two pool areas, and your comfy, pillow-topped feather bed. Everything you need is on property, including Away Spa, an Alain Ducasse eatery, a water-sports complex and a car-rental outpost (room rates start at $289 a night; wvieques.com).